a 查询"G.729"供应商 G.729 DSP-BASED SPEECH COMPRESSION CODEC A nalog Devices offers a G.729 full-duplex speech compression decoder, also called HIGHLIGHTS CS-ACELP (Conjugate-Structure · 8 Kbps Bit Rate at Toll Quality Algebraic Code Excited Linear Prediction). · 32 Kbps Bit Rate ADPCM under clean The decoder process the G.729 algorithm, channel condition which is a state-of-the-art voice compression · Discontinuous Transmission And Noise Fill ITU (International Telecommunications Union) During Non-Speech Intervals standard that can be used in a wide range of applications including wireless communications, · Optimizer Represented In Speech digital satellite systems, packetized speech and · Encodes Speech Using Conjugate- digital leased lines. Structure Algebraic Code-Excited Linear Prediction (CS-ACELP) G.729 provides 8 Kbps bandwidth for · Frame Size: 30 msec compressed speech at toll quality (equivalent to · Delay Time: 7.5 msec G.726 32 Kbps ADPCM under clean channel condition). Also, G.729 has lower · Minimum Buffer Size: 2.5 msec complexity and lower bit rate than G.728. · Other algorithm options available include: - G.728 This G.729 implementation provides a bit-exact - G.723 implementation of the ITU standard on a single - Acoustic Echo Cancellation Analog Devices ADSP-218x Digital Signal - Line Echo Cancellation Processor. The software is C callable and fully - DTMF Generation/Decode re-entrant, which enables easy interfacing and - V.34 Modem multi-channel capability. The encoder and decoder are fully independent, therefore, a DSP device can run a number of full-duplex or half-duplex channels. The coder and the decoder are able to operate under a real-time task switching kernel. For single chip performance, optimal specifications for G.729 utilize an ADSP- ANALOG DEVICES WORLDWIDE 218x processor with 17 MIPS, 5 K DM RAM . HEADQUARTERS and 9.6 K PM RAM. One Technology Way P.O. Box 9106 This chipset is sold as a combination DSP and Norwood, MA 02062-9106 software module under the part number USA ADSST-G729-XXXX. All software is tel: 617 461 3732 provided under license from the Software and fax: 617 461 4360 Systems Technology Division of Analog email: [email protected] Devices þ þ SOFTWARE & SYSTEMS TECHNOLOGY DIVISION .